What is the resistance of a spark plug?
Spark plug wire resistance. If you have a misfire all of the time, remove one one wire at a time with the engine running, with insulated pliers. When removing a wire which only makes a little or no differance to the engine RPM compared to the others will be the faulty wire. The actual resistance of any cable is down to its length,…
How many ohms does a spark plug wire have?
The resistance of many wires is measured in ohms per foot. A wire with high resistance can be in the 5000 ohms per foot range for especially high-output ignition systems, whereas a low resistance performance wire could easily get double digit ohms per foot.
How big is an inductive spark plug wire?
Testing an almost brand new wire, these were replaced about 5000 kilometres ago. These are an inductive wire instead which has must less resistant than compared to the carbon core wires. This wire is about 2 feet long so we should be expecting about 1300 to 2500 ohms.
What is the resistance of copper core wire?
For copper core wires, the resistance will be 1 to 6500 ohms, inductive wires the resistance will be 2200 to 8000 ohms per 1 meter or 650 to 2500 ohms per foot and carbon wires, the resistance is 10000 to 23000 ohms per 1 meter or 3000 to 7000 ohms per foot.
How much resistance should a spark plug wire have?
A good wire should have 1500 to 3500 ohms resistance. Replace any wires with resistance greater than 30,000 ohms which indicates that the internal conductor is failing. When handling spark plug wires, never bend the wires at sharp angles as this can cause an internal break in the wire.
What should resistance be for spark plug wires?
Using an ohmmeter, check resistance from the inside terminal of the distributor cap to the spark plug end of the cable. In both cases, resistance of any given spark plug wire should be between 3,000-6700 ohms per foot of wire.
How do you check the resistance of a spark plug?
Use an ohm meter to check the resistance of the wires. This can determine if the resistance of the wire is in compliance with the recommendations. Remove the wire from the engine by pulling the boot off the spark plug and unscrewing the wire at the other end. Then place one probe on each end of the wire.
How to check spark plug wire simply?
- Park your vehicle and allow the engine to cool.
- Remove the spark plug wire at the spark plug. Use the pliers as close to the end of the spark plug boot as possible.
- Remove the spark plug wire.
- Unclip the spark plug wire from the retaining clips.
- Visually check the spark plug wire for damage.
- Check the resistance of the wire.
- Apply the boot grease.